| Velainellidae | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | † Velainellidae Vasseur , 1880 |
| Genera and species | |
Velainellidae is a very small taxonomic family of fossil sea snails, marine gastropod mollusks in the superfamily Trochoidea, the top snails, turban snails and their allies.
This family contains only one genus: the Eocene genus Velainella, named by Vasseur 1880 and found in France.
Velainella has a long, narrow, almost straight-side shell with a smooth-lipped oval aperture.
Bouchet & Rocroi, 2005 included the Velainellidae in the vetigastropod superfamily Trochoidea, leaving the rank of the Vetigastropoda undecided. Previously W. F. Ponder and A. Warén 1988 put the Velainellidae in the Loxonematoidea (Koken 1889) a superfamily in the Mesogastropoda, Earlier, J. B. Knight, et al., 1960 in the Treatise included the Velainellidae, with Vellainella, in the Trochacea, as does Bouchet & Rocroi, 2005, but within the Archaeogastropoda. Trochacea is the original spelling for what is now Trochoidea.
Strepsodiscus is an extinct genus of very primitive fossil snail-like molluscs from the early part of the Late Cambrian of North America. The coiled, slightly asymmetrical shells are about 3 cm in height. It is not known whether these are shells of gastropods or monoplacophorans, which are more primitive mollusks.
The Bellerophontida is a taxonomic order of extinct marine mollusks that are found in the fossil record from the Lower Cambrian to the Lower Triassic. They are considered by some experts to be primitive sea snails with primarily symmetrically coiled shells, marine gastropod mollusks.
The Bellerophontidae are an extinct family of specialized globose bellerophontids, Paleozoic and early Triassic mollusks of the class Gastropoda.
Turbinidae, the turban snails, are a family of small to large marine gastropod molluscs in the superfamily Trochoidea.
Calliostomatidae is a family of sea snails within the superfamily Trochoidea and the clade Vetigastropoda.
Stomatellinae is a subfamily of small sea snails with a brilliantly nacreous interior of the shell, marine gastropod mollusks in the family Trochidae, the top snails.
Trochoidea is a superfamily of small to very large vetigastropod sea snails with gills and an operculum. Species within this superfamily have nacre as the inner shell layer. The families within this superfamily include the Trochidae, the top snails. This superfamily is the largest vetigastropodan superfamily, containing more than 2,000 species.
Liotiidae is a family of small sea snails, marine gastropod mollusks in the clade Vetigastropoda.
Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouchet and Rocroi, 2005.
Bellerophontoidea, common name "bellerophonts", is a superfamily of extinct planospirally-coiled globose molluscs. This superfamily is generally included within the Gastropoda, but may instead be a group of monoplacophorans. The taxon first appeared late in the Cambrian and continued until late in the Triassic.
Turbinoidea was a superfamily of small to large sea snails, marine gastropod mollusks in the clade Vetigastropoda. But it is no longer used in the current taxonomy of gastropods sensu Williams et al. (2008).
Seguenzioidea is a superfamily of minute to medium-sized sea snails, marine gastropod mollusks in the clade Vetigastropoda.
Macluritidae is an extinct family of relatively large, Lower Ordovician to Devonian, macluritacean gastropods(?), hypserstrophically coiled, that is dextral while appearing sinistral, of which the genus Maclurites is arch-typical. The base of their shells is flat or gently protruding while the upper side is generally concave.
Paraturbinidae is an extinct family of snails from the Mesozoic period, gastropod mollusks.
†Onychochilidae is an extinct family of small, fossil, upper Cambrian to lower Devonian molluscs. They have hyperstrophically coiled shells which generally have smooth whorls and elongate apertures. They are commonly considered to be gastropods, i.e. sea snails.
Angarioidea is a superfamily of small to medium sized sea snails, marine gastropod molluscs in the clade Vetigastropoda.
This overview lists proposed changes in the taxonomy of gastropods at the family level and above since 2005, when the taxonomy of the Gastropoda by Bouchet & Rocroi (2005) was published. In other words, these are recent updates in the way various groups of snails and slugs are classified.
The Trochina is a taxon that is used by paleontologists. It is a suborder of primitive sea snails, marine gastropod mollusks.
Margaritidae is a family of small sea snails, marine gastropod mollusks in the superfamily Trochoidea.
Trochida is an order of small to very large vetigastropods. It includes recent and extinct sea snails with gills and an operculum.